GEEK TIME: Mr. Carlson's Lab - Tube Heater Flash

[ajaxlepinski]

Just found this in my favorites links. Not sure if I posted it before but, it's cool and Mr. Carlson ROCKS!!!.

[video]https://www.youtube.com/watch?v=bX0o3jAzSBs[/video]

[soulsurfer]

I'm not an EE not even hobby. But I always find this sort of thing fascinating.
I could watch this guy all day long and not get bored....well watch him in between my porn stints. Mental masturbation is just as important as the physical

[ajaxlepinski]

Dude! Mr. Carlson's collection of oscilloscopes gives me a woodie!

[soulsurfer]

I know right!? His backdrop is like

[Riffraff]

I didn't know filament flash would lead to filament failure. I have a few Mullards and Matsushita Mullard clones that do that.

[Zozobra]

I didn't know filament flash would lead to filament failure. I have a few Mullards and Matsushita Mullard clones that do that.

Honestly, I wouldn't sweat it too much and it may not be filament flash. Is the offending tube in a cathode follower position? Sometimes the flash isn't the heaters, but arcing between the grid and cathode as the potential between them is high until the cathode heats up and starts conducting. That can be eliminated with a diode and resistor from grid to cathode to limit the difference until the tube has started conducting.

[Riffraff]

No it was just V1 in my Tweaker. I had heard that Mullards do that a lot and noticed some of mine do. I picked up some Matushita's because I got a deal on them. The story goes they were made on old Mullard equipment that Philips sent to Japan when they closed the Blackburn plant. Mullard had world wide popularity and Philips wanted to continue that line at Matsushita. They sent the tooling, all of the manufacturing details and a team of Blackburn engineers to get the line up and running. I thought the flash was a sign that they really nailed them.

[ajaxlepinski]

Just did a search for Matsushita Tubes... it turns out that they sold their tubes in the US under the National and Concord brands.
Ebay has a bunch of National Tubes but, no Concord.